Russian forces have intensified an artillery-supported assault on the embattled city of Sievierodonetsk and have pushed the Ukrainian troops out of central neighborhoods, the Ukrainian military said Monday.

The city is one of just two cities in the Luhansk region of the Donbas that Russia does not completely control. Regional governor Serhiy Haidai said the Russians aim to encircle Sievierodonetsk, destroying bridges that connect to the city center. He said mass evacuations are impossible due to shelling and that the military manages to evacuate only a few people a day.

“The Russians are making every effort to cut off Sievierodonetsk,” Haidai said. “The next two or three days will be significant.”

Leonid Pasechnik, head of the self-proclaimed Luhansk People’s Republic, said the Ukrainians making their stand in Sievierodonetsk should save themselves the trouble.

“If I were them, I would already make a decision” to surrender, he said. “We will achieve our goal in any case.”

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Latest developments

►China has overtaken Germany as the biggest buyer of Russian energy exports. The Centre for Research on Energy and Clean Air said Monday that Russia received about 93 billion euros in revenue from the sale of oil, natural gas and coal since the Feb. 24 invasion – 12.1 billion euros from Germany, 12.6 billion euros from China.

►Andriy Pokrasa, 15, and his dad, Stanislav, are being hailed in Ukraine for their volunteer aerial reconnaissance work after using their small drone in the early days of the Russian invasion, pinpointing coordinates and swiftly messaging the precious information to the Ukrainian military.

Russia may need reinforcements to take Donbas: British military

The Russians have been leaning on their superiority in troops and artillery to make considerable headway in the industrial Donbas region of eastern Ukraine but will probably need to replenish their forces, according to a British intelligence assessment.

“Russia will likely have to rely on new recruits or mobilized reservists to deploy these units to Ukraine,” said Sunday’s assessment, tweeted out before the ministry posted a map of Ukraine highlighting the territory controlled by Russia in the east and south. It’s a large chunk, including most of the Donbas, where the sides continue to wage a ferocious battle for the crucial city of Sievierodonetsk in the Luhansk province.